Lost Mammoth Valley is a Pathfinder adventure for four 4th-level characters by Jessica Catalan. This adventure continues the Quest for the Frozen Flame Adventure Path, a three-part monthly campaign in which the heroes lead a band of nomadic hunter-gatherers across a brutal primordial landscape. This adventure also includes an examination of megafauna, including advice and rules for creating your own new giant animals; a glossary of Mammoth Lords depictions of Golarions most popular deities; and new prehistoric creatures to befriend or bedevil your players.